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   1 /*
   2  * Copyright © 2012 Keith Packard <keithp@keithp.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; version 2 of the License.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  16  */
  17
  18 #include <ao.h>
  19 #include <ao_radio_spi.h>
  20 #include <ao_radio_cmac.h>
  21
  22 static __xdata struct ao_radio_spi_reply ao_radio_spi_reply;
  23
  24 static __xdata struct ao_radio_spi_request ao_radio_spi_request;
  25
  26 static __xdata uint8_t  slave_state;
  27
  28 static void
  29 ao_radio_slave_low(void)
  30 {
  31         uint16_t        i;
  32
  33         if (slave_state != 1)
  34                 ao_panic(1);
  35         ao_gpio_set(AO_RADIO_SLAVE_INT_PORT, AO_RADIO_SLAVE_INT_BIT, AO_RADIO_SLAVE_INT_PIN, 0);
  36         for (i = 0; i < 1000; i++)
  37                 ao_arch_nop();
  38         slave_state = 0;
  39 }
  40
  41 static void
  42 ao_radio_slave_high(void)
  43 {
  44         if (slave_state != 0)
  45                 ao_panic(2);
  46         ao_gpio_set(AO_RADIO_SLAVE_INT_PORT, AO_RADIO_SLAVE_INT_BIT, AO_RADIO_SLAVE_INT_PIN, 1);
  47         slave_state = 1;
  48 }
  49
  50 static void
  51 ao_radio_slave_spi(void)
  52 {
  53         ao_spi_get_slave(AO_RADIO_SLAVE_BUS);
  54         for (;;) {
  55                 ao_spi_recv(&ao_radio_spi_request,
  56                             (2 << 13) | sizeof (ao_radio_spi_request),
  57                             AO_RADIO_SLAVE_BUS);
  58                 ao_radio_slave_high();
  59                 ao_spi_recv_wait();
  60                 switch (ao_radio_spi_request.request) {
  61                 case AO_RADIO_SPI_RECV:
  62
  63                         /* XXX monitor CS to interrupt the receive */
  64
  65                         ao_config.radio_setting = ao_radio_spi_request.setting;
  66                         ao_led_on(AO_LED_RX);
  67                         ao_radio_spi_reply.status = ao_radio_recv(&ao_radio_spi_reply.payload,
  68                                                                   ao_radio_spi_request.recv_len,
  69                                                                   ao_radio_spi_request.timeout);
  70                         ao_led_off(AO_LED_RX);
  71                         ao_radio_spi_reply.rssi = 0;
  72                         ao_spi_send(&ao_radio_spi_reply,
  73                                     AO_RADIO_SPI_REPLY_HEADER_LEN + ao_radio_spi_request.recv_len,
  74                                     AO_RADIO_SLAVE_BUS);
  75                         ao_radio_slave_low();
  76                         ao_spi_send_wait();
  77                         continue;
  78                 case AO_RADIO_SPI_CMAC_RECV:
  79                         ao_config.radio_setting = ao_radio_spi_request.setting;
  80                         ao_led_on(AO_LED_RX);
  81                         ao_radio_spi_reply.status = ao_radio_cmac_recv(&ao_radio_spi_reply.payload,
  82                                                                        ao_radio_spi_request.recv_len,
  83                                                                        ao_radio_spi_request.timeout);
  84                         ao_led_off(AO_LED_RX);
  85                         ao_radio_spi_reply.rssi = ao_radio_cmac_rssi;
  86                         ao_spi_send(&ao_radio_spi_reply,
  87                                     AO_RADIO_SPI_REPLY_HEADER_LEN + ao_radio_spi_request.recv_len,
  88                                     AO_RADIO_SLAVE_BUS);
  89                         ao_radio_slave_low();
  90                         ao_spi_send_wait();
  91                         continue;
  92                 case AO_RADIO_SPI_SEND:
  93                         ao_config.radio_setting = ao_radio_spi_request.setting;
  94                         ao_led_on(AO_LED_TX);
  95                         ao_radio_send(&ao_radio_spi_request.payload,
  96                                       ao_radio_spi_request.len - AO_RADIO_SPI_REQUEST_HEADER_LEN);
  97                         ao_led_off(AO_LED_TX);
  98                         break;
  99
 100                 case AO_RADIO_SPI_CMAC_SEND:
 101                         ao_config.radio_setting = ao_radio_spi_request.setting;
 102                         ao_led_on(AO_LED_TX);
 103                         ao_radio_cmac_send(&ao_radio_spi_request.payload,
 104                                            ao_radio_spi_request.len - AO_RADIO_SPI_REQUEST_HEADER_LEN);
 105                         ao_led_off(AO_LED_TX);
 106                         break;
 107
 108                 case AO_RADIO_SPI_CMAC_KEY:
 109                         ao_xmemcpy(&ao_config.aes_key, ao_radio_spi_request.payload, AO_AES_LEN);
 110                         break;
 111
 112                 case AO_RADIO_SPI_TEST_ON:
 113                         ao_config.radio_setting = ao_radio_spi_request.setting;
 114                         ao_radio_test(1);
 115                         break;
 116
 117                 case AO_RADIO_SPI_TEST_OFF:
 118                         ao_radio_test(0);
 119                         break;
 120                 }
 121                 ao_radio_slave_low();
 122         }
 123 }
 124
 125 static __xdata struct ao_task ao_radio_slave_spi_task;
 126
 127 void
 128 ao_radio_slave_init(void)
 129 {
 130         ao_add_task(&ao_radio_slave_spi_task, ao_radio_slave_spi, "radio_spi");
 131         ao_enable_output(AO_RADIO_SLAVE_INT_PORT, AO_RADIO_SLAVE_INT_BIT, AO_RADIO_SLAVE_INT_PIN, 0);
 132 }